Resolve "OTB does not compile with GCC 8.1"

Closes #1706

See merge request orfeotoolbox/otb!216

Resolve "Display Pixel type of Image in ReadImageInfo application"

Closes #819

See merge request orfeotoolbox/otb!179

Merge branch '819-display-pixel-type-of-image-in-readimageinfo-application' of https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb into 819-display-pixel-type-of-image-in-readimageinfo-application

Resolve "Fail computing KMeans Classification on image with NaN pixels"

Closes #1586

See merge request orfeotoolbox/otb!201

More warning fixes for Shark

See merge request orfeotoolbox/otb!208

DOC: add missing packages needed to compile otb with superbuild on ubuntu 18.04

See merge request !207

Merge branch '819-display-pixel-type-of-image-in-readimageinfo-application' of https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb into 819-display-pixel-type-of-image-in-readimageinfo-application

Metadata reading from compound datasets

See merge request orfeotoolbox/otb!202

Some warning fixes

See merge request orfeotoolbox/otb!206